High Engine Idle with Manual Transmission on Mazda B2500

A high idle speed can be caused by a poor connection at the Throttle Position Sensor (TPS). Connector replacement kits are available from Mazda dealers and possibly some Ford dealers.

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Average mileage: 126,166 (61,000–200,000)
Engine affected: 2.5L 4 Cylinder
4 model years affected: 1998, 1999, 2000, 2001
15 people reported this problem
7 people shared problem details
1998 Mazda B2500- 2.5L 4 Cylinder97,500
when I'm driving along. I put the trans in nutural to stop so I don't have to use the clutch.Thats when the motor starts ideling fast.It goes to about 4000 rpm's before it goes back to where it belongs just under a 1000 rpm's. I think it could be a vacume leak? I'm not sure...
1999 Mazda B2500- 2.5L 4 Cylinder61,000
Engine speed increases, often as high as 3500 rpm, when clutch is depressed. Doesn't happen all the time. Drops back to normal when truck is brought to a stop.
1998 Mazda B2500- 2.5L 4 Cylinder
Idle surges to high rpm's? Idle sensor connector at top middle rear of motor gets dust in it. Disconnect, blow out, and tape w/electrical tape to keep dust out. Never had a problem since.
2000 Mazda B2500- 2.5L 4 Cylinder170,000
I have had this 3 times (fixed twice) and only seems to happen when it is very hot outside.
2000 Mazda B2500- 2.5L 4 Cylinder114,000
I have a 2000 B2500, with the manual transmission. I had the high idle problem and the poor idle condition. Every once in a while it would run rough and no engine light. I replaced the throttle position sensor,and took apart all the harness connection spots and cleaned them. I also replaced the timing belt, water pump, spark plugs, and the wires. The truck runs perfect now. I don't know witch one of those fixed that problem, but for about 200 dollars in parts and a weekend of working on it, it runs perfect. I get about 2-3 more miles per gallon now also. Its well worth the time to just replace everything listed above and be done with it.
2000 Mazda B2500- 2.5L 4 Cylinder200,000
Idles at 3k rpm
1998 Mazda B2500- 2.5L 4 Cylinder89,000
engine idles down very slow
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